How to become a generalist?

I don't know what category this should be in exactly. =(

Okay, let say, we found an earth-like planet, lots of food, green grass, clean air, clean water.. just like the earth used to be.. And you're in charge on designing the social structure that will generate maximum happiness for all human beings. How would you based your decisions?

How do you know what area of the planet should people live?

How do you design a city?

How do you know where to place the educational area, hospitals, recreation area, production area etc?

What kind of education?(today we have grading system, exams. basically memorization)

How will you prevent air pollution, contamination etc?

How will you prevent crimes?

How will you prevent wars?

Will you permit traditions? if so how do you know which tradition is to permit?

What about the individual's access to goods and services?

How will you design the road system so it doesn't jammed?

How do you know how much population it can support?(not population control, but just an ideal population)

You can answer whichever you feel like answering and you can add details if you want.